DIGITAL / ANALOG TRAINER
MODEL XK-550
A COMPLETE MINI-LAB FOR BUILDING, TESTING
AND PROTOTYPING ANALOG AND DIGITAL CIRCUITS
Tools and meter not included.
Instruction Manual
For Trainer with Organizer Case
TM
Elenco Electronics, Inc.
TM
Copyright © 2004, 1994 by Elenco Electronics, Inc. All rights reserved.
Revised 2004
REV-G
No part of this book shall be reproduced by any means; electronic, photocopying, or otherwise without written permission from the publisher.
753550
GENERAL SPECIFICATIONS FOR MODEL XK-550
Power Supplies:
• 0V to 20VDC @ .5 amp (0V to 15V @ 1 amp)
• 0V to –20VDC @ .5 amp (0V to –15V @ 1 amp)
• +12V +5% @ 1 amp
• –12V +5% @ 1 amp
• +5V +5% @ 1 amp
• 30V AC center-tapped at 15VAC @ 1 amp.
• Load regulation all DC supplies less than .2V no load to .5A
• Line regulation all DC supplies less than .2V 105 to 135V
• Hum and ripple all DC supplies less than .01V rms
• Short protection all DC supplies - Internal IC thermal cutoff
• Fuse - 1.25A, 250V
Function Generator Analog Section:
• Waveforms sine, square, triangle, complimentary square
• Frequency - 1Hz to 100kHz in 5 steps continuously variable
• Fine frequency adjust - 10:1 approximate
• Amplitude variable 0-15Vpp
• Output impedance 330Ω: short protected
• DC offset change +10V from zero crossing
Digital Section:
• Data switches, eight DPDT, Hi 5V, low 0V
• Logic switches, two no bounce with complimentary output
“On” voltage level 2.8V min., “Off” voltage level 1V max.
Input impedance 100kΩ.
• Eight LED readouts, 100kΩ input impedance
• Clock frequency, 1Hz to 100kHz in 5 steps continuously variable
• Clock amplitude, 5Vpp squarewave
• Clock rise time, better than 100nsec.
Bredboards Section:
• Two bredboards containing 830 tie points each (total 1,660 pins)
• 6 independent power bus lines for common connections
Variable Resistance (undedicated):
• 1kΩ Potentiometer
• 100kΩ Potentiometer
-1-
USERS DESCRIPTION OF FRONT PANEL CONTROL
7
8
9 10 11 12
6
13
14
15
16
17
18
19
5
4
20
3
2
1
1)
Fuse holder - Easy access for replacement of
1.25A 250V fuse.
2)
On-Off switch - Allows power to be applied to
all outputs. Switch will light when on.
3)
4)
11) Two logic switches - These are no bounce
logic switches. Give one signal state change
per movement of switch.
12) Selects five ranges of frequencies from 10 to
100,000 hertz.
Power output terminals - This provides
30VAC center tapped at 15VAC - also provides
output terminal for positive and negative
variable voltages.
13) Fine frequency control - allows easy
selection of desired function generator
frequency.
Variable positive voltage control - Varies
positive voltage from 0 to 20V at indicated
output terminal.
5)
Variable negative voltage control - Varies
negative voltage from 0 to –20V at indicated
output connector pin.
6)
Output terminals for 1kΩ and 100kΩ
undedicated potentiometers.
14) Amplitude control - Controls the function
generation output amplitude, 0-15Vpp.
15) DC offset control - controls the DC level of
the generator output. DC may be varied +10
volts from zero level.
16) Input points for logic indicator LEDs. “A”
input corresponds with A lamp, etc.
17) Logic indicators LEDs, total eight.
7)
1kΩ undedicated potentiometer.
8)
100kΩ undedicated potentiometer.
18) Eight data switches - Output 5V or 0V
depending on position.
9)
Waveform selection control, square, triangle
or sine generator waveforms.
19) Output terminals for all functions as stated, 4
pins per block.
10) Output terminals for all functions as stated, 4
pins per block.
20) Two breadboards containing a total of 1,660
tie points including 6 independent bus lines.
-2-
INTRODUCTION
Congratulations on your purchase of the Elenco
Model XK-550 Digital / Analog Trainer. This trainer
is designed to simplify designing of digital and
analog circuits. It contains most of the necessary
test equipment needed to build and test these
circuits.
Your XK-550 has four basic trainers in a single
package. They are, 5 independent power supplies,
an analog trainer, a digital and a bredblock
assembly trainer. We shall proceed in describing
each trainer in the following sections.
POWER SUPPLY
Model XK-550 has five built-in power supplies which
will satisfy most design needs. This includes two
variable power supplies giving up to +20 volts and
–20 volts at .5 amp. Below 15V the current available
is over 1 amp. Three fixed power supplies give you
+12VDC, –12VDC or +5VDC at 1 amp each. These
fixed voltages are the most commonly used
voltages for design work. All supplies are regulated
to within 150mV. This means that you can increase
the current draw from no load to .5 amp and the
voltage will change less than 150 millivolts. All
supplies are also short circuit protected by using
integrated circuit regulator devices.
ANALOG TRAINER SECTION
FUNCTION GENERATOR
The analog trainer contain a complete function
generator capable of producing sine, square and
triangle waveform. The frequency of this generator
is continuously variable from one hertz to over
100,000 hertz in five steps. A fine tuning control
makes selection of any frequency easy. The output
voltage amplitude is variable between 0 to 15Vpp.
The output impedance is approximately 330 ohms.
DIGITAL TRAINER SECTION
The digital trainer has the necessary functions to do
your digital designs. They consist of a clock
generator, two no bounce logic switches, 8 LED
indicator lamps and 8 data switches. These
functions will make it easy to do your digital
experiments.
-3-
TESTING THE XK-550 DIGITAL ANALOG TRAINER
The following paragraphs give detailed instructions
on testing the digital / analog trainer.
TESTING THE FUNCTION GENERATOR
To test the function generator, you will need an
oscilloscope. Connect the scope to the terminal
marked FREQ., and the ground clip to the terminal
marked GND. Adjust the waveform switch to sine,
the coarse frequency switch to 1k and the amplitude
control to maximum. Your scope should show a sine
wave with an output of about 15Vpp. If the sinewave
is clipped on top or bottom, adjust the DC offset
control for the most linear reading. Turn the FINE
ADJ control and the frequency should vary between
100 and 1000 hertz. Check the other coarse
frequency positions.
Note that in the XK-550 trainer there are five major
functions, (1) Power Supply (2) Logic Indicators (3)
Function Generator (4) Logic Switches and (5) Data
Switches. We shall proceed in testing out each
section. If any test fails, refer to the schematic
diagram and check the wiring and soldering of the
section involved.
POWER SUPPLY TESTING
Plug the trainer into a 120VAC outlet and switch to
the “ON” position (the power switch should light).
With a digital voltmeter, measure the voltage
outputs at the power blocks. The +12V should
measure between 11.4 and 12.6 volts. The 5V
supply should read between 4.75 and 5.25 volts.
The –12V supply should read between –11.4 and
12.6 volts.
Now, check the CLK output terminal. You should
see a square wave of about 5Vpp. If the scope is a
dual trace, connect one input to the CLK and the
other FREQ terminal. Set the waveform switch to
squarewave. You will note the two frequencies are
180O out of phase. If no scope is available, connect
a wire to the CLK terminal and input to “A” of the
logic indicators. Connect another wire to the FREQ
terminal and input “B”. Set the coarse frequency
switch to 10 hertz and the fine freq control to
minimum position. The two LEDs should blink
alternately.
Do not short the 15VAC output to ground.
Short the +12V, –12V and +5V supply to ground.
They should turn off and recover when the short is
removed. If you have a 25Ω 10 watt resistor, place
it across the output terminal (2 watt resistor will
work, but use it only for a few seconds). The output
of the 12V supply should not change more than 0.20
volts. Do the same on the 5V supply using a 10Ω 5
watt resistor. Again, the output should not change
more than 0.20 volts. In making this test, the
voltmeter leads should be clipped to the terminal
directly and no to the load leads. This is to prevent
errors due to voltage drop from contact resistance of
the load.
TESTING THE LOGIC INDICATOR FUNCTION
There are eight logic indicators which you will be
checking out. Place a wire to the 5V power supply
and touch the “A” logic indicator test pin. The “A”
LED should light up. Remove the wire and the LED
should go out. Do the same for the B, C, D, E, F, G
and H test pins.
Check the variable voltage supplies in the same
manner. Set the output voltage between 10-15
volts. Place the 25Ω 10 watt resistor across the
output terminal. The voltage should stay within 0.20
volts of the no load voltage.
-4-
TESTING THE LOGIC SWITCHES
There are two logic switches and four conditions to
be checked out. Connect a wire from the “X” test
pin to the “A” logic indicator test pin. Connect
another from the “X” test pin to the “B” test pin.
TESTING THE DATA SWITCHES
There are eight data switches to be checked. The
output of the switches are at 5V or ground
depending on position. Connect a wire to SW1
terminal and the “A” test pin, the “A” LED should
light when the switch is placed toward the top case.
Repeat the same test on SW2, SW3, SW4, SW5,
SW6, SW7 and SW8.
Apply power and note that the “A” LED indicator
should be lit when the logic switch is in the “X”
positions and the “B” LED is not lit. Moving the logic
switch to “X” should reverse the indicator LEDs, that
is, the “B” LED should light and the “A” LED not light.
Check the Y logic switch in the same manner.
This completes the testing of the trainer.
CIRCUIT DESCRIPTION
The XK-550 power supply features two variable
output voltages and three fixed 12V, –12V and 5V,
variable output voltages are 0V to 20V and 0V to
–20V at up to 1 ampere maximum current. All
supplies are regulated to better than .2V when
going from no load to full load. Varying the input AC
voltage from 105 to 135V will have practically no
effect on the output voltages. This is because of the
specially designed IC circuits used in the XK-550
circuits. Severe overloading or even shorting the
output circuits will not damage the supplies. Special
turn-off circuits in the IC sense the overload and
turn off the output.
it isolates the power supply output from the 120VAC
line. This prevents the user from dangerous voltage
shock should he or she be standing in a grounded
area.
AC TO DC CONVERTER
The AC to DC converter consists of diodes D1, D3
and capacitor C1. Transformer T1 has two
secondary windings which are 180O out of phase.
The AC output at each winding is shown in Figure
2A and 2B.
Diodes are semiconductor devices that allow current
to flow in one direction. The arrow in Figure 3 points
to the direction current will flow. Only when the
transformer voltage is positive will current flow
through the diodes. Figure 3 shows the simplest
possible rectifier circuit. This circuit is known as a
half-wave rectifier. Here the diode conducts only half
of the time when the AC wave is positive as shown
in 2C. Use of this circuit is simple but inefficient. The
big gap between cycles require much more filtering
to obtain a smooth DC voltage.
THE POSITIVE 0V TO 20V POWER SUPPLY
Figure 1 shows a simplified circuit diagram of the
positive supply. It consists of a power transformer, a
DC rectifier stage and the regulator stage.
TRANSFORMER
The transformer T1 serves two purposes. First, it
reduces the 120VAC input to 17VAC to allow the
proper voltage to enter the rectifier stages. Second,
120VAC
Input
Transformer
120V to 17V
17VAC
AC to DC
Converter
20VDC
Simplified diagram of positive power supply
Figure 1
-5-
Voltage
Regulator
0V - 15V
Regulated
Output
By the addition of a second diode and transformer
winding we can fill in the gap between cycles as
shown in Figure 4. This circuit is called full-wave
rectification. Each diode conducts when the voltage
is positive. By adding the two outputs, the voltage
presented to capacitor C1 is more complete, thus
easier to filter, as shown in Figure 2E. When used
in 60 cycles AC input power, the output of a full
wave rectifier will be 120 cycles.
draw about 1mA current. Transistor Q2 sees the
current source as a very high resistor of about 1
meg ohms. Thus, the gain of transistor Q2 is
extremely high.
Voltage Waveform for Supply
A) Transformer
Winding AB
Capacitor C1 is used to store the current charges,
thus smoothing the DC voltage. The larger the
capacitor, the more current is stored. In this design
1000µF capacitors are used, which allows about 5
volts AC ripple when one amp is drawn.
B) Transformer
Winding BC
Half Wave Rectifier
Figure 3
C) Output of
diode D1.
D) Output of
diode D2.
In practice, the current through the diodes is not as
shown in Figure 2C. Because capacitor C1 has a
charge after the first cycle, the diode will not
conduct until the positive AC voltage exceeds the
positive charge in the capacitor. Figure 5 shows a
better picture of what the current flow looks like
assuming no loss in the diode.
E) Total of diodes
D1 & D2.
20V
F) Output of capacitor C1
Ripple depends on load
current (expanded).
Full Wave Rectifier
Figure 2
It takes a few cycles for the voltage to build up on
the capacitor. This depends on the resistance of the
winding and diode. After the initial start-up, there
will be a charge and discharge on the capacitor
depending on the current drawn by the output load.
Remember, current only flows through the diodes
when the anode is more positive than the cathode.
Thus, current will flow in short bursts as shown in
Figure 5.
Figure 4
20V
Peak
A) Transformer
Winding
20V
B) Voltage C1
C) Current
through diodes
Figure 5
The DC load current may be one ampere but the
peak diode current may be three times that.
Therefore, the diode rating must be sufficient to
handle the peak current. The 1N4001 has peak
current rating of 10 amps.
REGULATOR CIRCUIT
The regulator circuit in the Model XK-550 power
supply consists of a LM-317 integrated circuit. This
IC is specially designed to perform the regulation
function. Figure 6 shows a simplified circuit of how
the LM-317 IC works.
Current
Source
Equalized
to 1 Meg.
Q5
Q3
2V
Output
R1
Q4
Q2
1.5V
R2
Q1
Divider
Transistors Q1 and Q2 form a circuit known as a
differential amplifier.
Transistor Q1 base is
connected to a stable 1.5V reference voltage. The
base of Q2 is connected to the regulator output
circuit through a voltage divider network. The
collector of transistor Q2 is connected to a current
source. This basically is a PNP transistor biased to
Figure 6
-6-
SCHEMATIC DIAGRAM
-7-
-8-
Transistor Q5 is called the pass transistor. It
controls the current reaching the output. Transistor
Q3 and Q4 are emitter followers. Their function is to
raise the impedance of the pass transistor. Note that
transistor Q2, Q3, Q4, Q5 and resistor R1 form a
close loop. Also note that the feedback to the base
of Q2 is negative, that is, when the base of Q2 goes
positive, the output at emitter Q5 goes negative.
Now if the 2V output voltage goes down because of
current drain at the output, the base of Q2 will drop
forcing the the collector voltage of Q2 to go higher.
This will bring the output voltage back to 2V. This is
the basis of all negative feedback regulators.
THE LOGIC SWITCHES
The logic switches perform the same function as the
data switch, that is, they produce high or low states.
But there is one big difference. When switching the
data switches, many pulses may be produced due
to bouncing of the contacts.
In the logic switches, only one pulse is produced, no
matter how many times the contacts bounce. This
is extremely important if you are producing pulses
for counting circuits. Figure 7 shows the wiring of
the logic switch. The two NAND gates are
connected so that when X input is grounded the
output X goes high. Opening and closing the
ground at X will not change the output. Only when
X is grounded will the output change to low. Thus,
only one output change is produced with one
movement of the X switch. There are two outputs
from logic switch, X and X or Y and Y.
Another feature of the LM-317 regulator is to protect
the IC against overload and output shorts. If the IC
is overloaded, the junction of an overload transistor
will overheat.
A transistor will sense this
overheating and shut down transistor Q5.
The LM-317 IC basically is a 1.25 volt regulator. To
be able to vary the output from 0 to 20V, you stack
the IC on the negative 1.25VDC voltage as shown in
Figure 6A. When VR1 equals 0, the output voltage
is 0 volts.
1
X
X
3
2
4
5
X
6
X
0V - 20V
LM-317
Figure 7
R1
VR1
THE FUNCTION GENERATOR
The function generator frequencies are produced by
an XR-2206 integrated circuit. This IC is capable of
producing high quality sine, square, and triangle
waveform of high stability and accuracy. Figure 8
shows the block diagram of the XR-2206 IC.
–DC
Figure 6A
THE NEGATIVE VOLTAGE REGULATOR
The theory of the voltage regulator is the same as
the previously discussed positive regulator. The
basic difference is that diodes D1 and D3 are
reversed producing a negative voltage across
capacitor C1. The LM-337 IC is designed to operate
from a negative supply.
AM Input
1
Sine/Saw
Output
2
Mult. Out
3
V+
Timing
Capacitor
THE DATA SWITCHES
There are eight data switches labeled SW1 to SW8.
The circuit is very simple. To perform the desired
functions there is a double throw-double pole
switch. One end is connected to the 5V, the other to
ground and the center lug is connected to the
output.
Timing
Resistor
16
+1
Multiplier
and
Sine
Shaper
4
14
13
5
Waveform
ADJ.
12
Ground
11
Sync
Output
10
Bypass
9
FKS
Input
VCO
6
7
8
Current
Switches
Figure 8
-9-
15
Symmetry
ADJ.
The XR-2206 is comprised of four functional blocks,
a voltage controlled oscillator (VCO), an analog
multiplier & sine shaper, a unity gain buffer amplifier
and a set of current switches.
The VCO produces a squarewave signal. This
squarewave is sent to a shaper and converted into
a sine wave.
THE LOGIC INDICATORS
There are eight logic indicators. Figure 9 shows the
circuit. It consists of a 74HC04 IC. When the input
is over 2.8V, the output of the IC will be low, drawing
current through the LED indicator. The 120 ohm
resistor limits the current in the LED to about 30mA.
The VCO actually produces an output frequency
proportional to an input current. Across pins 5 and
6, a timing capacitor, is switched on to give 5
different ranges of frequencies via COARSE FREQ.
switch. On pin 7, the FINE FREQ. ADJ. variable
resistor controls the actual frequency output. These
two components form the RC time constants for the
oscillator frequency.
74HC04
Figure 9
-10-
LED
5V
PARTS LIST
Qty.
Description
Resistors
4 100Ω 1/4W 5% brn-blk-brn-gold
10 120Ω 1/4W 5% brn-red-brn-gold
1 200Ω 1/4W 5% red-blk-brn-gold
1 220Ω 1/4W 5% red-red-brn-gold
2 330Ω 1/4W 5% org-org-brn-gold
5 1kΩ 1/4W 5% brn-blk-red-gold
2 1.2kΩ 1W 5% brn-red-red-gold
1 2kΩ 1/4W 5% red-blk-red-gold
2 4.7kΩ 1/4W 5% yel-vio-red-gold
1 6.8kΩ 1/4W 5% blu-gry-red-gold
1 8.2kΩ 1/4W 5% gry-red-red-gold
1 10kΩ 1/4W 5% brn-blk-org-gold
1 12kΩ 1/4W 5% brn-red-org-gold
3 22kΩ 1/4W 5% red-red-org-gold
1 47kΩ 1/4W 5% yel-vio-org-gold
1 51kΩ 1/4W 5% grn-brn-org-gold
16 100kΩ 1/4W 5% brn-blk-yel-gold
1 100kΩ Pot Trim
1 1kΩ Pot PC Mount
2 2kΩ Pot PC Mount
1 10kΩ Pot PC Mount
3 100kΩ Pot PC Mount
1
1
1
1
1
1
4
1
2
5
2
4
Capacitors
5pF 10% 50V Disc
22pF 10% 50V Disc
100pF 10% 50V Disc
.001µF 10% 100V Mylar
.0022µF 10% 50V Disc
.01µF 10% 100V Mylar
.1µF 10% 100V Mylar
1µF 50V Lytic Radial
10µF 25V Lytic Radial
100µF 25V Lytic Radial
1000µF 25V Lytic Radial
1000µF 35V Lytic Radial
19
2
2
1
1
1
1
1
1
1
1
1
8
2
Semiconductors
1N4001
1N4148
2N3904 NPN Transistor
2N3906 PNP Transistor
LM317 Regulator
LM337 Regulator
LF357 Integrated Circuit
XR2206 Integrated Circuit
SN7403 Integrated Circuit
LM7805 Regulator
LM7812 Regulator
LM7912 Regulator
LED Red
74HC04 Integrated Circuit
Qty.
Part#
Description
Miscellaneous
1 Transformer
1 PC Board
1 Fuse 1.25A
10 Switch Slide PC Mount DPDT
1 Switch Rotary 2P5POS
1 Switch Rotary 4P3POS
1 Switch Rocker Illuminated
2 Connector 3-pin
2 Connector 4-pin
1 Connector 5-pin
1 Bracket
4 Bracket L 4-40 Tap
1 Top Panel
1 Panel Side Right
1 Panel Side Left
9 Knob Push On
1 Plastic Case
1 Bushing Insulated
1 Spacer Nylon 7/16” 4-40 Tap
8 Spacer 1/4” #8 Plastic
1 Cord Retainer
2 Screw #10-32 x 3/8” Hex
1 Screw #4-40 x 1/4” Phil Flat
9 Screw #4-40 x 1/4” Phil Truss
8 Screw #6-32 x 5/16” Sltd Bndr
4 Screw #4 x 1/4” AB Phil Blk
6 Screw #6 x 3/8” AB Phil Blk
4 Screw #8 x 1/2” A Phil Blk
7 Nut Pot 7mm
2 Nut Pot 9mm
8 Nut #6-32 Hex
2 Nut #10-32 Hex
7 Washer Flat 8mm ID x 14mm OD
2 Washer Flat 9mm ID x 15mm OD
2 Washer flat black #6
5 Washer Fiber #4
2 Lockwasher #6 Internal
2 Lockwasher #10 External
1 Lug Solder #8
1 Fuse Holder
1 IC Socket 8-Pin
3 IC Socket 14-Pin
1 IC Socket 16-Pin
18 Bredblox 4-Pin
1 Label XK-550 Case
5 Insulator Mica
5 Insulator Washer
5” Wire 20GA Red Stranded
2’ Wire 22GA Jumper
1 Line Cord
2” Shrink Tubing 1/2” Dia
1½” Shrink Tubing 3/4” Dia
1 9426 Bredboard
1 9830 Bredboard
131000
131200
132000
132200
133300
141000
141202
142000
144700
146800
148200
151000
151200
152200
154700
155100
161000
191610
192412
192421
192531
192612
205010
212210
221017
231017
232216
241017
251017
261047
271045
281045
291045
291046
314001
314148
323904
323906
330317
330337
330357
332206
337403
337805
337812
337912
350002
39HC04
-11-
Part#
44K500
514550
530125
541009
542206
542405
541204
591032
591042
591052
613003
613008
614102
614551
614554
622009
623016
624009
624013
624124
628003
641158
641431
641438
641641
642430
642660
642862
644101
644102
644601
644810
645101
645103
645400
645404
646600
646910
661002
663000
664008
664014
664016
665204
723501
780002
780101
813210
845000
862105
891101
899110
99426
99830
ORGANIZER CARRYING CASE
The carrying case for the XK-550 Digital/Analog
Trainer has been designed to hold a meter and
many of the most important tools. The layout below
shows a suggestive layout for equipment and tools.
The sloped side pocket of the case next to the
trainer can accommodate a wide range of different
meters.
(ST-2) 5” Long Nose Pliers
(ST-1) 4 1/2” Side Cutter
(JW-140) Wire Jumper Kit
(ST-7) IC Puller
(ST-3) Wire Stripper
(SP-2) Desoldering Pump
(TM-30) Tool MTG Kit
(ST-6) #1 Phillips Screwdriver
(ST-5) 3/16” Blade Screwdriver
METERS - ANY of the following will
fit the special slope cavity
METERS AVAILABLE:
M-2795
M-2666K
M-1700
M-3900
LCM-1950
M-2625
M-1750
M-1000C
M-6100
and others in catalog
(PSV-50) Anti-static foam for
storage of ICs and velcro for
mounting meter
When ordering a meter to be used with the XK-550
trainer, specify a PSV-50 kit which will provide you
with velcro hold the meter in place and an anti-static
foam pad that fits below the meter for storage of ICs.
This is supplied FREE with meter order.
When ordering tools, specify a TM-30 tool MTG kit.
When four or more tools are ordered, the tool MTG
kit is supplied FREE!
-12-
POPULAR METERS THAT CAN BE USED WITH THE XK-550 TRAINER
Model M-2795
Model M-1700
Features
Features
• 3 3/4 digit, 4,000 count display
• 3 1/2 digit, 2,000 count display
• Audible continuity test
• Frequency to 20MHz
• Data hold / rel. value
• Capacitance to 20µF
• Frequency to 15MHz
• Diode and transistor test
• Capacitance to 200µF
• Audible continuity
• Transistor / diode / logic test
• AC/DC current to 10A
• AC/DC current to 10A
• 3-way overload protection
• Auto power off
• Low cost
• Holster included
• Holster included
Specifications
Specifications
AC volts
Accuracy
400mV, 4V, 40V, 400V, 750V
4V, 40V, 400V: +(0.8% + 3) 400mV, 750V: +(1.2% + 3)
AC + DC volts
Accuracy
200mV, 2V, 20V, 200V, 600V
+(0.5% rdg +1 dgt) DC, +(1% rdg +4 dgts) AC
Resolution 100µV
DC volts
Accuracy
400mV, 4V, 40V, 400V, 1000V
400mV, 4V, 40V, 400V: +(0.5% + 3)
AC current
Accuracy
40µA, 400µA, 4000µA, 40mA, 400mA, 10A
40µA, 400µA, 4000µA: +(1.5% + 5) 40mA, 400mA: +(2% + 5) 10A: +(2.5% + 5)
AC + DC current
Accuracy
2mA, 20mA, 200mA, 10A
2.5%
Resolution 100µA
DC current
Accuracy
40µA, 400µA, 4000µA, 40mA, 400mA, 10A
40µA, 400µA, 4000µA: +(1.2% + 3) 40mA, 400mA: +(1.5% + 3) 10A: +(2% + 5)
Resistance
Accuracy
200Ω, 2kΩ, 20kΩ, 200kΩ, 2MΩ, 20MΩ
+(0.8% rdg +3 dgts) 200Ω, +(3.0% +3 dgts) 20MΩ Resolution 0.1Ω
Resistance
Accuracy
400Ω, 4kΩ, 40kΩ, 400kΩ, 4MΩ, 40MΩ, 400MΩ
400Ω, 4kΩ, 40kΩ, 400kΩ, 4MΩ: +(1%+3) 40MΩ: +(2%+3) 400MΩ: +(3%+10)
Capacitance
Accuracy
2nF, 20nF, 200nF, 2µF, 20µF
+5%
Resolution 1pF
Capacitance
Accuracy
4nF, 40nF, 400nF, 4µF, 40µF, 200µF
4nF: +(5%+10) 40nF: +(3%+10) 400nF, 4µF, 40µF: +(2%+5) 200µF: +(4%+5)
Frequency
Accuracy
10Hz - 20MHz autoranging
0.5%
Resolution 1Hz
Frequency
Sensitivity
10Hz - 15MHz +(0.1% + 5)
Sine wave 0.6Vrms
Accessories
Test leads, manual, 9V battery included
Options
C-90, C-17
Accessories
Heavy-duty test leads, holster, manual, & 9V battery included
Dimensions
6” (H) x 2 1/2” (W) x 1 1/4” (D)
Dimensions / weight
7 1/2” (H) x 3 1/2” (W) x 1 3/4” (D) (without holster) / 10.56 oz. (without holster)
Weight
7.4 oz.
1000V: +(0.8% + 3)
Model M-1750
Compact Multimeter
Model M-1000C
Features
• 3 3/4 digit, 4,000 count display
Features
• Frequency to 10MHz
• 3 1/2 digit, 2,000 count display
• Transistor test
• Audible continuity
• Diode test
• Signal injector
• Overload protection
• Pocket-size
• Low cost
• Capacitance to 200µF
• Diode and transistor test
• Audible continuity
• AC/DC current to 10A
• 3-Way overload protection
• Holster included
• Relative measurement
Specifications
Available as a kit (M-1006K)
AC + DC volts
Accuracy
400mV, 4V, 40V, 400V, 600V
0.5% DC, 0.8% AC
Resolution 100µV
AC + DC current
Accuracy
400µA, 4000µA, 40mA, 400mA, 10A
1.5%
Resolution 0.1µA
Resistance
Accuracy
400Ω, 4kΩ, 40kΩ, 400kΩ, 4MΩ, 40MΩ
1Ω
Capacitance
Accuracy
4nF, 40nF, 400nF, 4µF, 40µF, 400µF
+2%
Frequency
Accuracy
10Hz - 10MHz autoranging
0.5%
Accessories
Specifications
AC + DC volts
Accuracy
Input impedance
200mV, 2V, 20V, 200V, 1000V, 200VAC, 750VAC
DC 0.5%, AC 1.2%
1MΩ
Resolution 1pF
DC current
Accuracy
200µA, 2mA, 20mA, 200mA, 10A
+1.2% rdg + 2 Digits
Resolution 1Hz
Resistance
Accuracy
200Ω, 2kΩ, 20kΩ, 200kΩ, 2MΩ
+1.2% rdg + 2 Digits
Test leads, manual, holster, 9V battery included
Accessories
Test leads, manual, 9V battery included
Dimensions
6” (H) x 2 1/2” (W) x 2 1/4” (D)
Dimensions
5” (H) x 2 29/32” (W) x 1” (D)
Weight
9.3 oz.
Weight
4.5 oz.
Resolution 0.1Ω
-13-
Resolution 0.1mV
Resolution 0.1µA
Resolution 0.1Ω
WARRANTY POLICY
Your XK-550 Digital / Analog Trainer has been tested and conforms to our rigid requirements on performance and durability. It is
guaranteed to be free of defects in workmanship, materials and construction for a period of 2 years. If this product should fail during
normal use within the first 3 months from the date of purchase, ElencoTM will repair or replace the unit at no cost. For the remainder of
the warranty period, a nominal service charge is required to cover shipping and handling.
When returning merchandise for repair, please include proof of purchase, a brief letter of explanation of problem and sufficient packing
material. Before returning any merchandise, please call our service department at (847) 541-3800 to obtain a return merchandise
authorization number (RMA).
Elenco Electronics, Inc. Service Department
150 W. Carpenter Avenue Wheeling, IL 60090
TM
-14-
TM
Elenco Electronics, Inc.
150 W. Carpenter Avenue
Wheeling, IL 60090
(847) 541-3800
http://www.elenco.com
e-mail: elenco@elenco.com